Wut?
https://www.sfflab.com/products/ncase_m1 - 12.6L https://www.dan-cases.com/dana4.php - 7.2L
There's a pretty big community that builds high-end gaming rigs / workstations in these cases. I've built in both. Originally I built in the Ncase but sold it to a colleague when I moved abroad. Recently I just built in the DANcase and wish I had have stuck with the Ncase. The extra 4 liters of volume goes a long way in improving thermals, due to the extra clearance for a CPU cooler.
Anyway, just found that line in the article annoying, even a cursory Google search shows that there's a plethora of 7-12L SFF PC cases out there.